Crosshead



H. SHOEMAKER. CROSSHEAD.

APPLICATIQN FILED NOV. 10, 1921.

1 436 9 1 5 o Patmted Nov. 28, 19 22;

Patented Na. as, i922.

CRUSSHEAD.

Application filed November 10, 1921. Serial No 514,194.

To all whom it may concern.

Be it known that 1, Hammer Snonnrannn, a citizen of the UnitedStates,and a resident of lVollaston, in the county of Norfolk and Stateof Massachusetts, have invented a certain new and useful Improvement inCrossheads, of which improvement the following is a specification.

This invention relates to engine cross heads and guides, and moreparticularly to that type in which the cross head slides upon provide animproved and simple construd tion which may be readily taken down andreapplied,to preserve accurate alignment, to Pi'OViClt increased bearingsurface for the cross head on the guides, and to prov an improvedwearing connection for the cross head which may be readily adjusted fortat:-

ing up lost motion and wear without the use of tools, jigs, or templetsand at thesame time maintain correct alignment oi the cross head uponthe guides.

One feature of my improvement comprises pair of tubular guides withbinder bolts ex ending through the same for securing said tubes to theback cylinder head and to the guide yoke. Another feature comprisessplit tubular bushings or gibs carried by the,

cross head and mounted on the guides. Still another feature comprisesthe use or" thin tubular shims surrounding the gibs tor taking up lostmotion due to wear.

in the accompanying drawing: Figure 1 a side view partly in sideelevation and partly in section, showing a construction at cross headand guides embodying my im- 'irovementg 2, a transverse section taken onthe line 2-2 of 1; Fig. 3, a transverse section of the cross head shoeand guide taken on the line 3-3 of Fig. l; and,

head, 7, of the engine cylinder, and at the other end by extending intoopenings in the guide yoke, 8, the guides being securely held. inposition by the hinder or anchor holts, 9,

, bushings or gibs, 11 which may beisplit at one or both sides, and areformed with llanges,12, which are clampedbymeans or I the gib caps, 13,mounted by a screw thread cylindrical guide rods, the ObJGCtS being toconnection upon each end of the shoe of the cross head. Tne gibs maybeformed of hronzmgunfmeital, or hard, babbitt,: and as wear occursbetween the gibs and the tubular guides, thin tubular shim, 14-, of tin,russia iron, or other sheet metal, may bev inserted between theoutersurface ofthe'gibs and the inner sur 'ace oi": theopening through thecross head shoe, The shim preferably e:-:- tends the full length of theshoe to form a lining therefor, and may be split throughout its length,in order that it may be put on over the tubular guide, 6.

The method of taking up lost motion is very simple since it is onlynecessary to loosen the gib caps, 1:2, and insert a tubular shim, 1-1,or remove the worn gibs and replace them with others, or both of theseoperations as desired, and then reapply the gib caps, 12, screwing thesame up tight in order to securely clamp the nib flanges against theends oi. the shoe. The gib caps may then be fastened by the set screws,15, The cross head is provided with the usual piston rod connection, 17,and a main pin, 16, for the main rod, (not shown), which is adapted toextend through the opening in the guide yoke in the usual. manner.

The construction. is exceedingly simple, composed of but few parts, andcan be readily taken down and again applied in a minimum time and with aminimum number of tools. Another important feature is the perfectalignment otthe guides which do not vary from correct line even whentaken down and again applied. The bearing of the gibs in the cross headis also maintained in perfect alignment withthe guides after the shimsare inserted or after worn gibs are replaced with new ones. By means ofmy improved construction, an increased bearing area is obtained on theguides so that a shorter guide bearing is made possible, therebyreducing weight and espouse,

Having now described my invention, What I claim as new and desire tosecure by Letters Patent is:

1. The combination with cylindrical guides, of a cross head having shoesprovided with openings for said guides, tubular gibs mounted in saidopenings, and means for clamping said gibs in position.

2. The combination with cylindrical guides, of a cross head having shoesprovided with openings for said guides, a pair of tubular gibs mountedin each of said openings and having flanges at their outer ends, and gibcaps for clamping said flanges.

3. The combination with cylindrical guides, of a cross head having shoesprovided with openings for said guides, tubular gibs mounted in saidopenings, and a tubular shim surrounding said gibs.

at. The combination of a tubular guide for a cross head, a back cylinderhead having a socket for supporting one end of said guide, a guide yokesupporting the other epd, and a binder bolt extending through saidtubular guide and fastened at its end to said back head.

other end, and a binder bolt extending through said tubular guide andfastened to the cylinder head.

6. The combination of a cylindrical tubular guide for cross heads, aback cylinder head having means for supporting one end of said guide, aguide yoke supporting the other end, a binder bolt extending throughsaid tubular guide and fastened at one end to the cylinder head, andmeans for securing the. other end of said bolt tothe guide yoke.

'7. The combination ofa cylindrical tubular guide for cross heads, aback cylinder head having means for supporting one end of said guide, aguide yoke supporting the other end, a binder bolt extendingthrough saidtubularguide. and having a "threaded connection to the cylinder head,and a clamp mounted on the guide yoke for fastening the other end ofsaid bolt.

8. The combination with a pair of guides, having convex bearingsurfaces, of a cross head having shoes provided with spaces for saidguides, detachable gibs mounted in said spaces and having concavebearing surfaces, and means for fastening said gibs in position.

In testimony whereof I have hereunto set my hand.

HARVEY SHOEMAKER.

